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var postforms = document.evaluate( "//form[translate(@method, ’POST ’, ’post’)=’post’]", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
var t = {}; console.log(t.__parent__); -- Window XPCNativeWrapper#XPCNativeWrapper_.E3.81.AF.E4.BD.95.E3.82.92.E3.81.99.E3.82.8B.E3.81.AE.E3.81.8B